gonad

Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

n. An organ in animals that produces gametes, especially a testis or ovary.

from Wiktionary, Creative Commons Attribution/Share-Alike License

n. A sex organ that produces gametes; specifically, a testicle or ovary.

n. The testicles.

from the GNU version of the Collaborative International Dictionary of English

n. One of the masses of generative tissue primitively alike in both sexes, but giving rise to either an ovary or a testis; a generative gland; a germ gland.

from The Century Dictionary and Cyclopedia

n. In biology, a germ-gland; a germinal or reproductive gland or organ, in the widest sense, producing sperm-cells or egg-cells; an ovary or a spermary, of whatever kind, in a primitive or an indifferent state.

Uranium particles, whether pure uranium or in an oxidized form, are alpha emitters, and can be highly carcinogenic and mutagenic if ingested or inhaled, since they can lodge in one part of the body -- the kidney or lung or gonad, for example -- and then irradiate surrounding cells with large, destructive alpha particles (actually helium atoms), until some gene is compromised and a cell become malignant.